Comments by "Fhf Fhf" (@fhffhff) on "GrandExam" channel.

  1. (х-у)(х+у)=55, х-у=1,х+у=55; х=28,у=27, (±28;±27)х-у=5,х+у=11;х=8,у=3, (±8;±3)
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  2. 0,5*8*3sina/(0,5sina*12*11)=2/11, 11/2*S-S=36, S=36/(9/2)=4*2=8
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  3. {x²-2x-1=±(x-1), x²-3x=0, x=0, x≥1, [x²-x-2=0,x=3, x<1, {x≥1,. [x=(1±√9)/2, 0/. {x≥1, x=3, x=2,
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  4. (х⁵+х+1)/(х²+х+1)=х³-х²+1
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  5. (1+√(1+4x()/2=(x+√(x2+4x))/2 {x≥1/6;[x=0,20x²-19x+4=0;x=(19±√41)/40 {(19+ √41)/40} x+x/y=y 0=y²-xy-x y=(x+√(x²+4x))/2
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  6. f(x²)=f(x)/2 x=2^2^n f(2^2^(n+1))=f(2)/2^(n+1) f(x)=f(2)/log2(x) f(xy)=f(2)/log 2(xy)=f(2)/(og2(yx)
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